hi i have a 2010 cobalt ss and for some reason the car has made a popping noise since about 2 months after i bought it. The noise started at 6,000 miles and I currently have 12,600 miles. I bought the car in april of this year. The noise would occur at either low or high speeds. After several trips to the dealer they decided it was the rear seat panel on the drivers side that made the noise. The panel did no good as it still occurred so finally i took it to another dealer and they found the noise that it made at high speeds (it was wires in the headliner that had come loose), they taped the wires back up. BUT i still have the noise at lower speeds like if i turn into my subdivision or if i go over small bumps and stuff like that. Any idea what it could possibly be? My guess is its something small.

 

possibly rear suspension bushings...

 

Take it to a dealership if you still have warrenty. Shouldn't be a huge deal I'd think

 

i have a bad noise in mine in the rear now. sounds like the wing vibrating when i go over bumps. i took it to the dealer and that said one of my rear control axle bushings are gone...

 

i have the same sound and i have no idea what it is.....it happens to me when im stopped sitting at a light

 

I have the same issue with sitting at the light and getting a random pop noise while stopped.

 

tRUNK MONKEY?

In all serious, if it sounds like someone tapping on your trunk while sitting still, it is the evap vent valve by the gas tank most likely. Common on cobalts. It's not bad, it's just venting.

As for going over bumps it's probably suspension related.

 

damn trunk monkeys! lol

 

Just came across this my car does this while sitting. It's three knocks. Is there a fix for this or is it just there.

 

I believe it's something to do with the EVAP system. Nothing you can do about it.

 

Hi dhicks13,

I apologize that you are experiencing a knocking. I would be happy to get you in contact with your local dealership so that this can be looked into. If this is something you would like me to assist you with, please reach out via PM with your full contact information, VIN, current mileage, and involved dealership.

Sincerely,

Jonathan A. (Assisting)
Chevrolet Customer Care